A=x+y over 2solve for y.

In this equation y = 2a - x

Step-by-step explanation:

In order to find this, we simply need to follow the order of operations to solve for y.

a = (x + y)/2 > Multiply both sides by 2

2a = x + y > Subtract x from both sides.

2a - x = y

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step-by-step explanation:

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.